Asus Zenfone Selfie ZD551KL vs. Zenfone 2 ZE551ML: A Detailed Showdown

The Asus Zenfone Selfie and Zenfone 2 were popular mid-range phones, each boasting unique strengths. The Selfie prioritized camera capabilities, while the Zenfone 2 offered a more powerful processor and faster charging. Let's dive into a comprehensive comparison to help you decide which one holds up best today.
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🏆 Quick Verdict

The Zenfone Selfie ZD551KL edges out the Zenfone 2 due to its significantly better sunlight display contrast and longer battery life. However, the Zenfone 2's faster charging and potentially more responsive performance (depending on RAM configuration) are compelling factors. It's a close call, leaning towards the Selfie for overall usability.

PHONES
Phone Names Asus Zenfone Selfie ZD551KL Asus Zenfone 2 ZE551ML
Network
2G bandsGSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
3G bandsHSDPA 850 / 900 / 1900 / 2100HSDPA 850 / 900 / 1900 / 2100
4G bands1, 2, 3, 5, 7, 8, 20 - Global1, 2, 3, 4, 5, 8, 9, 18, 19, 28 - Taiwan
SpeedHSPA 42.2/5.76 Mbps, LTE Cat4 150/50 MbpsHSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps
TechnologyGSM / HSPA / LTEGSM / HSPA / LTE
 1, 3 - India-
Launch
Announced2015, June. Released 2015, August2015, January. Released 2015, March
StatusDiscontinuedDiscontinued
Body
BuildGlass front (Gorilla Glass 4), plastic back, plastic frameGlass front (Gorilla Glass 3), plastic back, plastic frame
Dimensions156.5 x 77.2 x 10.8 mm (6.16 x 3.04 x 0.43 in)152.5 x 77.2 x 10.9 mm (6.00 x 3.04 x 0.43 in)
SIMDual SIM (Micro-SIM, dual stand-by)Dual SIM (Micro-SIM, dual stand-by)
Weight170 g (6.00 oz)170 g (6.00 oz)
Display
ProtectionCorning Gorilla Glass 4, oleophobic coatingCorning Gorilla Glass 3
Resolution1080 x 1920 pixels, 16:9 ratio (~403 ppi density)1080 x 1920 pixels, 16:9 ratio (~401 ppi density)
Size5.5 inches, 82.6 cm2 (~68.3% screen-to-body ratio)5.5 inches, 83.4 cm2 (~70.8% screen-to-body ratio)
TypeIPS LCDIPS LCD
Platform
CPUOcta-core (4x1.7 GHz Cortex-A53 & 4x1.0 GHz Cortex-A53)Quad-core 2.3 GHz (4 GB RAM model)Quad-core 1.8 GHz (2 GB RAM model)
ChipsetQualcomm MSM8939 Snapdragon 615 (28 nm)Intel Atom Z3580 (4 GB RAM model)Intel Atom Z3560 (2 GB RAM model)
GPUAdreno 405PowerVR G6430
OSAndroid 5.0 (Lollipop), upgradable to 6.0 (Marshmallow), ZenUIAndroid 5.0 (Lollipop), upgradable to 6.0 (Marshmallow)
Memory
Card slotmicroSDXC (dedicated slot)microSDXC (dedicated slot)
Internal16GB 2GB RAM, 32GB 3GB RAM16GB 2GB RAM, 32GB 2GB RAM, 32GB 4GB RAM, 64GB 4GB RAM, 128GB 4GB RAM
 eMMC 4.5-
Main Camera
FeaturesLaser AF, Dual-LED dual-tone flash, panorama, HDRDual-LED dual-tone flash, panorama, HDR
Single13 MP, f/2.0, 28mm (wide), 1/3.0"13 MP, f/2.0, AF
Video1080p@30fps1080p@30fps
Selfie camera
FeaturesDual-LED dual-tone flash-
Single13 MP, f/2.2, 1/3.1", 1.12µm, AF5 MP, f/2.0
Video1080p@30fps-
Sound
3.5mm jack YesYes
35mm jackYesYes
Loudspeaker YesYes
Comms
Bluetooth4.0, A2DP, EDR4.0, A2DP, EDR
NFCNoYes
PositioningGPS, GLONASS, BDSGPS, GLONASS
RadioFM radio, RDSFM radio, RDS
USBmicroUSB 2.0, OTGmicroUSB 2.0, OTG
WLANWi-Fi 802.11 a/b/g/n/ac, Wi-Fi Direct, hotspotWi-Fi 802.11 a/b/g/n/ac, Wi-Fi Direct, hotspot
Features
SensorsAccelerometer, gyro, proximity, compassAccelerometer, gyro, proximity, compass
Battery
Charging-18W wired, 60% in 40 min
TypeLi-Po 3000 mAh, removableLi-Po 3000 mAh, non-removable
Misc
ColorsPure White, Chic Pink, Aqua BlueOsmium Black, Sheer Gold, Glacier Gray, Glamor Red, Ceramic White
ModelsZ00UD, Z00UDH, Z00UDC, Z00UDBZ00AD, Z00A
PriceAbout 280 EURAbout 300 EUR
SAR EU-0.35 W/kg (head)
Tests
Audio quality Noise -92.1dB / Crosstalk -92.5dB-
Battery life Endurance rating 63h Endurance rating 59h
Camera Photo / Video Photo / Video
Display Contrast ratio: 928:1 (nominal), 1.680 (sunlight)-
Loudspeaker Voice 65dB / Noise 66dB / Ring 75dB Voice 62dB / Noise 61dB / Ring 67dB
Performance Basemark OS II 2.0: 883Basemark X: 4915 Basemark OS II 2.0: 1090Basemark X: 12565
OUR TESTS
Audio qualityNoise -92.1dB / Crosstalk -92.5dB-
Battery (old)Endurance rating 63hEndurance rating 59h
CameraPhoto / VideoPhoto / Video
DisplayContrast ratio: 928:1 (nominal), 1.680 (sunlight)-
LoudspeakerVoice 65dB / Noise 66dB / Ring 75dBVoice 62dB / Noise 61dB / Ring 67dB
PerformanceBasemark OS II 2.0: 883Basemark X: 4915Basemark OS II 2.0: 1090Basemark X: 12565

Asus Zenfone Selfie ZD551KL

  • Excellent sunlight display contrast
  • Longer battery life (63h)
  • Camera-focused design

  • Older chipset (Snapdragon 615)
  • Potentially slower performance compared to Zenfone 2 (4GB RAM model)

Asus Zenfone 2 ZE551ML

  • Faster charging (18W)
  • Potentially faster performance (4GB RAM model with Intel Atom Z3580)
  • Multiple RAM options (2GB/4GB)

  • Shorter battery life (59h)
  • Less impressive display contrast
  • Intel Atom processor can be less efficient

Display Comparison

The Zenfone Selfie boasts an impressive contrast ratio of 928:1 (nominal) and a remarkable 1680:1 in sunlight, making it exceptionally viewable outdoors. The Zenfone 2's display, while decent, doesn't match this level of sunlight visibility. Both phones feature similar screen sizes and resolutions, but the Selfie's display is the clear winner.

Camera Comparison

The Zenfone Selfie, as its name suggests, heavily emphasized camera capabilities. While specific camera specs aren't detailed, it likely offered improved features and image processing compared to the Zenfone 2. Both phones featured Photo/Video capabilities, but the Selfie was marketed as a camera-centric device.

Performance

The Zenfone 2 has a potential performance advantage. The 4GB RAM model with the Intel Atom Z3580 offers a more modern architecture and potentially faster speeds than the Zenfone Selfie's Snapdragon 615. However, the 2GB RAM model's performance is more comparable. Real-world performance will depend heavily on RAM and software optimization.

Battery Life

The Zenfone Selfie shines in battery life, achieving an endurance rating of 63 hours, significantly surpassing the Zenfone 2's 59 hours. This difference translates to noticeably longer usage between charges. The Zenfone 2 does offer 18W fast charging, allowing it to reach 60% charge in just 40 minutes, mitigating the battery life disadvantage somewhat.

Buying Guide

The Asus Zenfone Selfie ZD551KL is ideal for users who prioritize camera quality, especially in bright conditions, and value extended battery life. The Asus Zenfone 2 ZE551ML is a better choice for those seeking a slightly faster processor and quicker charging, particularly if opting for the 4GB RAM model.

Frequently Asked Questions

❓ Is the Asus Zenfone Selfie good for photography?
Yes, the Zenfone Selfie was specifically designed with photography in mind, likely offering improved camera features and image processing compared to other phones of its time.
❓ Which Zenfone has better performance?
The Zenfone 2 with the 4GB RAM model and Intel Atom Z3580 generally offers better performance, but the 2GB RAM model is more comparable to the Zenfone Selfie.